I want to calculate fundamental time period (eigen value method, using command MODAL CALCULATION REQUESTED) of bridge pier in staad pro using lumped mass in long & Trans direction as per IRC 6 & IRC SP 114.
I am enclosing the details . I think there are some mistakes in my models. But I am not able to figure it out. Would any one be kind enough to check the models7140.Fundamental Time Period Trans Direction.std4760.Fundamental Time Period Long Direction.std?
Details are:
Span of superstructure: 27 m simply supported
Total DL of one span: 523 T
SIDL (Crash barrier + Wearing Coat) of one span: (54 T + 52 T)
Maximum Live load in the pier: 123 T
Depth of superstructure: 2.420 m
Bearing Type: Elastomeric Bearing
Total No of Bearing per Pier: 8
Shear Modulus of Elastomeric bearing: 1.15 Mpa
Total Beating Stiffness: 25870 kN/m
Pedestal: 0.80 m x 0.80m x 0.14 m
Pier Cap:
Rectangular (upper part):
Length (Transverse direction): 11.70 m
Width (Longitudinal Direction): 3.30 m
Height: 0.60 m
Trapezoidal (lower part):
Length at top (Transverse direction): 11.70 m
Width at top (Longitudinal Direction): 3.30 m
Height: 1.00 m
Length at bottom (Transverse direction): 2.10 m
Width at bottom (Longitudinal Direction): 2.10 m
Pier: Circular
Dia : 1.90m
Height: 5.5 m
Pile Cap:
Length: 4.3 m
Width: 4.3 m
Height: 1.5 m
Pile:
Total no: 4
Dia : 1.00 m
C/C spacing b/w pile: 3.0 m
Length of pile below pile cap: 14.0 m
Depth of Fixity below pile cap: 6.950 m
Type of Soil: Medium Soil